diff options
Diffstat (limited to 'lib/libc/mips/gen/setjmp.S')
| -rw-r--r-- | lib/libc/mips/gen/setjmp.S | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/lib/libc/mips/gen/setjmp.S b/lib/libc/mips/gen/setjmp.S new file mode 100644 index 0000000..2abc57b --- /dev/null +++ b/lib/libc/mips/gen/setjmp.S @@ -0,0 +1,160 @@ +/* $NetBSD: setjmp.S,v 1.17 2005/09/17 11:49:39 tsutsui Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Ralph Campbell. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); +#include <machine/regnum.h> + +#if defined(LIBC_SCCS) && !defined(lint) + ASMSTR("from: @(#)setjmp.s 8.1 (Berkeley) 6/4/93") + ASMSTR("$NetBSD: setjmp.S,v 1.17 2005/09/17 11:49:39 tsutsui Exp $") +#endif /* LIBC_SCCS and not lint */ + +#ifdef __ABICALLS__ + .abicalls +#endif + +/* + * C library -- setjmp, longjmp + * + * longjmp(a,v) + * will generate a "return(v)" from + * the last call to + * setjmp(a) + * by restoring registers from the stack, + * and a struct sigcontext, see <signal.h> + */ + +#define SETJMP_FRAME_SIZE (CALLFRAME_SIZ + (SZREG * 2)) + + +NESTED(setjmp, SETJMP_FRAME_SIZE, ra) + .mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ) + .set noreorder +#ifdef __ABICALLS__ + .cpload t9 +#endif + subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame +#ifdef __ABICALLS__ + .cprestore 16 +#endif + sw ra, CALLFRAME_RA(sp) # save RA + sw a0, CALLFRAME_SIZ(sp) # store env + + /* Get the signal mask. */ + addu a2, a0, _JB_SIGMASK * SZREG # &oenv + li a0, 1 # SIG_SETBLOCK + move a1, zero # &env == 0 + la t9, _C_LABEL(sigprocmask) # get current signal mask + jal t9 + nop + + lw a0, CALLFRAME_SIZ(sp) # restore env pointer + lw ra, CALLFRAME_RA(sp) # restore RA + addu sp, sp, SETJMP_FRAME_SIZE # pop stack frame + + li v0, _JB_MAGIC_SETJMP + sw v0, (_JB_MAGIC * SZREG)(a0) + sw ra, (_JB_REG_RA * SZREG)(a0) + sw s0, (_JB_REG_S0 * SZREG)(a0) + sw s1, (_JB_REG_S1 * SZREG)(a0) + sw s2, (_JB_REG_S2 * SZREG)(a0) + sw s3, (_JB_REG_S3 * SZREG)(a0) + sw s4, (_JB_REG_S4 * SZREG)(a0) + sw s5, (_JB_REG_S5 * SZREG)(a0) + sw s6, (_JB_REG_S6 * SZREG)(a0) + sw s7, (_JB_REG_S7 * SZREG)(a0) + sw sp, (_JB_REG_SP * SZREG)(a0) + sw s8, (_JB_REG_S8 * SZREG)(a0) + + move v0, zero + j ra +END(setjmp) + +#define LONGJMP_FRAME_SIZE (CALLFRAME_SIZ + (SZREG * 2)) + +NESTED(longjmp, LONGJMP_FRAME_SIZE, ra) + .mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ) + .set noreorder +#ifdef __ABICALLS__ + .cpload t9 +#endif + subu sp, sp, LONGJMP_FRAME_SIZE # allocate stack frame +#ifdef __ABICALLS__ + .cprestore 16 +#endif + sw ra, CALLFRAME_RA(sp) # save RA + lw v0, (_JB_MAGIC * SZREG)(a0) + li t0, _JB_MAGIC_SETJMP + bne v0, t0, botch # jump if error + nop + + sw a0, CALLFRAME_SIZ(sp) # save env + sw a1, (CALLFRAME_SIZ + SZREG)(sp) # save return value + + # set sigmask + addu a1, a0, _JB_SIGMASK * SZREG # &set + move a2, zero # &oset == NULL + li a0, 3 # SIG_SETMASK + la t9,_C_LABEL(sigprocmask) # set current signal mask + jal t9 + nop + + lw a0, CALLFRAME_SIZ(sp) # restore env + lw a1, (CALLFRAME_SIZ + SZREG)(sp) # restore return value + + lw ra, (_JB_REG_RA * SZREG)(a0) + lw s0, (_JB_REG_S0 * SZREG)(a0) + lw s1, (_JB_REG_S1 * SZREG)(a0) + lw s2, (_JB_REG_S2 * SZREG)(a0) + lw s3, (_JB_REG_S3 * SZREG)(a0) + lw s4, (_JB_REG_S4 * SZREG)(a0) + lw s5, (_JB_REG_S5 * SZREG)(a0) + lw s6, (_JB_REG_S6 * SZREG)(a0) + lw s7, (_JB_REG_S7 * SZREG)(a0) + lw sp, (_JB_REG_SP * SZREG)(a0) + lw s8, (_JB_REG_S8 * SZREG)(a0) + move v0, a1 + j ra + nop + +botch: + la t9, _C_LABEL(longjmperror) + jal t9 + nop + + la t9, _C_LABEL(abort) + jal t9 + nop +END(longjmp) |
